[1] Mt Sinai Hosp, Dept Microbiol, Toronto, ON M5G 1X5, Canada
[2] Univ Hlth Network, Toronto, ON, Canada
[3] Toronto Med Labs, Toronto, ON, Canada
[4] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[5] McMaster Univ, Div Infect Dis, Hamilton Hlth Sci Corp, Hamilton, ON, Canada
[6] Dalhousie Univ, Dept Microbiol, Queen Elizabeth II Hlth Sci Ctr, Halifax, NS, Canada